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sysfs: Remove support for tagged directories with untagged members (again)
[linux-btrfs-devel.git] / arch / arm / mach-ixp4xx / goramo_mlr.c
blob7548d9a2efe21499031c8e0b02f98070a151a9e9
1 /*
2 * Goramo MultiLink router platform code
3 * Copyright (C) 2006-2009 Krzysztof Halasa <khc@pm.waw.pl>
4 */
5
6 #include <linux/delay.h>
7 #include <linux/hdlc.h>
8 #include <linux/i2c-gpio.h>
9 #include <linux/io.h>
10 #include <linux/irq.h>
11 #include <linux/kernel.h>
12 #include <linux/pci.h>
13 #include <linux/serial_8250.h>
14 #include <asm/mach-types.h>
15 #include <asm/system.h>
16 #include <asm/mach/arch.h>
17 #include <asm/mach/flash.h>
18 #include <asm/mach/pci.h>
19
20 #define SLOT_ETHA 0x0B /* IDSEL = AD21 */
21 #define SLOT_ETHB 0x0C /* IDSEL = AD20 */
22 #define SLOT_MPCI 0x0D /* IDSEL = AD19 */
23 #define SLOT_NEC 0x0E /* IDSEL = AD18 */
24
25 /* GPIO lines */
26 #define GPIO_SCL 0
27 #define GPIO_SDA 1
28 #define GPIO_STR 2
29 #define GPIO_IRQ_NEC 3
30 #define GPIO_IRQ_ETHA 4
31 #define GPIO_IRQ_ETHB 5
32 #define GPIO_HSS0_DCD_N 6
33 #define GPIO_HSS1_DCD_N 7
34 #define GPIO_UART0_DCD 8
35 #define GPIO_UART1_DCD 9
36 #define GPIO_HSS0_CTS_N 10
37 #define GPIO_HSS1_CTS_N 11
38 #define GPIO_IRQ_MPCI 12
39 #define GPIO_HSS1_RTS_N 13
40 #define GPIO_HSS0_RTS_N 14
41 /* GPIO15 is not connected */
42
43 /* Control outputs from 74HC4094 */
44 #define CONTROL_HSS0_CLK_INT 0
45 #define CONTROL_HSS1_CLK_INT 1
46 #define CONTROL_HSS0_DTR_N 2
47 #define CONTROL_HSS1_DTR_N 3
48 #define CONTROL_EXT 4
49 #define CONTROL_AUTO_RESET 5
50 #define CONTROL_PCI_RESET_N 6
51 #define CONTROL_EEPROM_WC_N 7
52
53 /* offsets from start of flash ROM = 0x50000000 */
54 #define CFG_ETH0_ADDRESS 0x40 /* 6 bytes */
55 #define CFG_ETH1_ADDRESS 0x46 /* 6 bytes */
56 #define CFG_REV 0x4C /* u32 */
57 #define CFG_SDRAM_SIZE 0x50 /* u32 */
58 #define CFG_SDRAM_CONF 0x54 /* u32 */
59 #define CFG_SDRAM_MODE 0x58 /* u32 */
60 #define CFG_SDRAM_REFRESH 0x5C /* u32 */
61
62 #define CFG_HW_BITS 0x60 /* u32 */
63 #define CFG_HW_USB_PORTS 0x00000007 /* 0 = no NEC chip, 1-5 = ports # */
64 #define CFG_HW_HAS_PCI_SLOT 0x00000008
65 #define CFG_HW_HAS_ETH0 0x00000010
66 #define CFG_HW_HAS_ETH1 0x00000020
67 #define CFG_HW_HAS_HSS0 0x00000040
68 #define CFG_HW_HAS_HSS1 0x00000080
69 #define CFG_HW_HAS_UART0 0x00000100
70 #define CFG_HW_HAS_UART1 0x00000200
71 #define CFG_HW_HAS_EEPROM 0x00000400
72
73 #define FLASH_CMD_READ_ARRAY 0xFF
74 #define FLASH_CMD_READ_ID 0x90
75 #define FLASH_SER_OFF 0x102 /* 0x81 in 16-bit mode */
76
77 static u32 hw_bits = 0xFFFFFFFD; /* assume all hardware present */;
78 static u8 control_value;
79
80 static void set_scl(u8 value)
81 {
82 gpio_line_set(GPIO_SCL, !!value);
83 udelay(3);
84 }
85
86 static void set_sda(u8 value)
87 {
88 gpio_line_set(GPIO_SDA, !!value);
89 udelay(3);
90 }
91
92 static void set_str(u8 value)
93 {
94 gpio_line_set(GPIO_STR, !!value);
95 udelay(3);
96 }
97
98 static inline void set_control(int line, int value)
99 {
100 if (value)
101 control_value |= (1 << line);
102 else
103 control_value &= ~(1 << line);
104 }
105
106
107 static void output_control(void)
108 {
109 int i;
110
111 gpio_line_config(GPIO_SCL, IXP4XX_GPIO_OUT);
112 gpio_line_config(GPIO_SDA, IXP4XX_GPIO_OUT);
113
114 for (i = 0; i < 8; i++) {
115 set_scl(0);
116 set_sda(control_value & (0x80 >> i)); /* MSB first */
117 set_scl(1); /* active edge */
118 }
119
120 set_str(1);
121 set_str(0);
122
123 set_scl(0);
124 set_sda(1); /* Be ready for START */
125 set_scl(1);
126 }
127
128
129 static void (*set_carrier_cb_tab[2])(void *pdev, int carrier);
130
131 static int hss_set_clock(int port, unsigned int clock_type)
132 {
133 int ctrl_int = port ? CONTROL_HSS1_CLK_INT : CONTROL_HSS0_CLK_INT;
134
135 switch (clock_type) {
136 case CLOCK_DEFAULT:
137 case CLOCK_EXT:
138 set_control(ctrl_int, 0);
139 output_control();
140 return CLOCK_EXT;
141
142 case CLOCK_INT:
143 set_control(ctrl_int, 1);
144 output_control();
145 return CLOCK_INT;
146
147 default:
148 return -EINVAL;
149 }
150 }
151
152 static irqreturn_t hss_dcd_irq(int irq, void *pdev)
153 {
154 int i, port = (irq == IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N));
155 gpio_line_get(port ? GPIO_HSS1_DCD_N : GPIO_HSS0_DCD_N, &i);
156 set_carrier_cb_tab[port](pdev, !i);
157 return IRQ_HANDLED;
158 }
159
160
161 static int hss_open(int port, void *pdev,
162 void (*set_carrier_cb)(void *pdev, int carrier))
163 {
164 int i, irq;
165
166 if (!port)
167 irq = IXP4XX_GPIO_IRQ(GPIO_HSS0_DCD_N);
168 else
169 irq = IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N);
170
171 gpio_line_get(port ? GPIO_HSS1_DCD_N : GPIO_HSS0_DCD_N, &i);
172 set_carrier_cb(pdev, !i);
173
174 set_carrier_cb_tab[!!port] = set_carrier_cb;
175
176 if ((i = request_irq(irq, hss_dcd_irq, 0, "IXP4xx HSS", pdev)) != 0) {
177 printk(KERN_ERR "ixp4xx_hss: failed to request IRQ%i (%i)\n",
178 irq, i);
179 return i;
180 }
181
182 set_control(port ? CONTROL_HSS1_DTR_N : CONTROL_HSS0_DTR_N, 0);
183 output_control();
184 gpio_line_set(port ? GPIO_HSS1_RTS_N : GPIO_HSS0_RTS_N, 0);
185 return 0;
186 }
187
188 static void hss_close(int port, void *pdev)
189 {
190 free_irq(port ? IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N) :
191 IXP4XX_GPIO_IRQ(GPIO_HSS0_DCD_N), pdev);
192 set_carrier_cb_tab[!!port] = NULL; /* catch bugs */
193
194 set_control(port ? CONTROL_HSS1_DTR_N : CONTROL_HSS0_DTR_N, 1);
195 output_control();
196 gpio_line_set(port ? GPIO_HSS1_RTS_N : GPIO_HSS0_RTS_N, 1);
197 }
198
199
200 /* Flash memory */
201 static struct flash_platform_data flash_data = {
202 .map_name = "cfi_probe",
203 .width = 2,
204 };
205
206 static struct resource flash_resource = {
207 .flags = IORESOURCE_MEM,
208 };
209
210 static struct platform_device device_flash = {
211 .name = "IXP4XX-Flash",
212 .id = 0,
213 .dev = { .platform_data = &flash_data },
214 .num_resources = 1,
215 .resource = &flash_resource,
216 };
217
218
219 /* I^2C interface */
220 static struct i2c_gpio_platform_data i2c_data = {
221 .sda_pin = GPIO_SDA,
222 .scl_pin = GPIO_SCL,
223 };
224
225 static struct platform_device device_i2c = {
226 .name = "i2c-gpio",
227 .id = 0,
228 .dev = { .platform_data = &i2c_data },
229 };
230
231
232 /* IXP425 2 UART ports */
233 static struct resource uart_resources[] = {
234 {
235 .start = IXP4XX_UART1_BASE_PHYS,
236 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
237 .flags = IORESOURCE_MEM,
238 },
239 {
240 .start = IXP4XX_UART2_BASE_PHYS,
241 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
242 .flags = IORESOURCE_MEM,
243 }
244 };
245
246 static struct plat_serial8250_port uart_data[] = {
247 {
248 .mapbase = IXP4XX_UART1_BASE_PHYS,
249 .membase = (char __iomem *)IXP4XX_UART1_BASE_VIRT +
250 REG_OFFSET,
251 .irq = IRQ_IXP4XX_UART1,
252 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
253 .iotype = UPIO_MEM,
254 .regshift = 2,
255 .uartclk = IXP4XX_UART_XTAL,
256 },
257 {
258 .mapbase = IXP4XX_UART2_BASE_PHYS,
259 .membase = (char __iomem *)IXP4XX_UART2_BASE_VIRT +
260 REG_OFFSET,
261 .irq = IRQ_IXP4XX_UART2,
262 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
263 .iotype = UPIO_MEM,
264 .regshift = 2,
265 .uartclk = IXP4XX_UART_XTAL,
266 },
267 { },
268 };
269
270 static struct platform_device device_uarts = {
271 .name = "serial8250",
272 .id = PLAT8250_DEV_PLATFORM,
273 .dev.platform_data = uart_data,
274 .num_resources = 2,
275 .resource = uart_resources,
276 };
277
278
279 /* Built-in 10/100 Ethernet MAC interfaces */
280 static struct eth_plat_info eth_plat[] = {
281 {
282 .phy = 0,
283 .rxq = 3,
284 .txreadyq = 32,
285 }, {
286 .phy = 1,
287 .rxq = 4,
288 .txreadyq = 33,
289 }
290 };
291
292 static struct platform_device device_eth_tab[] = {
293 {
294 .name = "ixp4xx_eth",
295 .id = IXP4XX_ETH_NPEB,
296 .dev.platform_data = eth_plat,
297 }, {
298 .name = "ixp4xx_eth",
299 .id = IXP4XX_ETH_NPEC,
300 .dev.platform_data = eth_plat + 1,
301 }
302 };
303
304
305 /* IXP425 2 synchronous serial ports */
306 static struct hss_plat_info hss_plat[] = {
307 {
308 .set_clock = hss_set_clock,
309 .open = hss_open,
310 .close = hss_close,
311 .txreadyq = 34,
312 }, {
313 .set_clock = hss_set_clock,
314 .open = hss_open,
315 .close = hss_close,
316 .txreadyq = 35,
317 }
318 };
319
320 static struct platform_device device_hss_tab[] = {
321 {
322 .name = "ixp4xx_hss",
323 .id = 0,
324 .dev.platform_data = hss_plat,
325 }, {
326 .name = "ixp4xx_hss",
327 .id = 1,
328 .dev.platform_data = hss_plat + 1,
329 }
330 };
331
332
333 static struct platform_device *device_tab[6] __initdata = {
334 &device_flash, /* index 0 */
335 };
336
337 static inline u8 __init flash_readb(u8 __iomem *flash, u32 addr)
338 {
339 #ifdef __ARMEB__
340 return __raw_readb(flash + addr);
341 #else
342 return __raw_readb(flash + (addr ^ 3));
343 #endif
344 }
345
346 static inline u16 __init flash_readw(u8 __iomem *flash, u32 addr)
347 {
348 #ifdef __ARMEB__
349 return __raw_readw(flash + addr);
350 #else
351 return __raw_readw(flash + (addr ^ 2));
352 #endif
353 }
354
355 static void __init gmlr_init(void)
356 {
357 u8 __iomem *flash;
358 int i, devices = 1; /* flash */
359
360 ixp4xx_sys_init();
361
362 if ((flash = ioremap(IXP4XX_EXP_BUS_BASE_PHYS, 0x80)) == NULL)
363 printk(KERN_ERR "goramo-mlr: unable to access system"
364 " configuration data\n");
365 else {
366 system_rev = __raw_readl(flash + CFG_REV);
367 hw_bits = __raw_readl(flash + CFG_HW_BITS);
368
369 for (i = 0; i < ETH_ALEN; i++) {
370 eth_plat[0].hwaddr[i] =
371 flash_readb(flash, CFG_ETH0_ADDRESS + i);
372 eth_plat[1].hwaddr[i] =
373 flash_readb(flash, CFG_ETH1_ADDRESS + i);
374 }
375
376 __raw_writew(FLASH_CMD_READ_ID, flash);
377 system_serial_high = flash_readw(flash, FLASH_SER_OFF);
378 system_serial_high <<= 16;
379 system_serial_high |= flash_readw(flash, FLASH_SER_OFF + 2);
380 system_serial_low = flash_readw(flash, FLASH_SER_OFF + 4);
381 system_serial_low <<= 16;
382 system_serial_low |= flash_readw(flash, FLASH_SER_OFF + 6);
383 __raw_writew(FLASH_CMD_READ_ARRAY, flash);
384
385 iounmap(flash);
386 }
387
388 switch (hw_bits & (CFG_HW_HAS_UART0 | CFG_HW_HAS_UART1)) {
389 case CFG_HW_HAS_UART0:
390 memset(&uart_data[1], 0, sizeof(uart_data[1]));
391 device_uarts.num_resources = 1;
392 break;
393
394 case CFG_HW_HAS_UART1:
395 device_uarts.dev.platform_data = &uart_data[1];
396 device_uarts.resource = &uart_resources[1];
397 device_uarts.num_resources = 1;
398 break;
399 }
400 if (hw_bits & (CFG_HW_HAS_UART0 | CFG_HW_HAS_UART1))
401 device_tab[devices++] = &device_uarts; /* max index 1 */
402
403 if (hw_bits & CFG_HW_HAS_ETH0)
404 device_tab[devices++] = &device_eth_tab[0]; /* max index 2 */
405 if (hw_bits & CFG_HW_HAS_ETH1)
406 device_tab[devices++] = &device_eth_tab[1]; /* max index 3 */
407
408 if (hw_bits & CFG_HW_HAS_HSS0)
409 device_tab[devices++] = &device_hss_tab[0]; /* max index 4 */
410 if (hw_bits & CFG_HW_HAS_HSS1)
411 device_tab[devices++] = &device_hss_tab[1]; /* max index 5 */
412
413 if (hw_bits & CFG_HW_HAS_EEPROM)
414 device_tab[devices++] = &device_i2c; /* max index 6 */
415
416 gpio_line_config(GPIO_SCL, IXP4XX_GPIO_OUT);
417 gpio_line_config(GPIO_SDA, IXP4XX_GPIO_OUT);
418 gpio_line_config(GPIO_STR, IXP4XX_GPIO_OUT);
419 gpio_line_config(GPIO_HSS0_RTS_N, IXP4XX_GPIO_OUT);
420 gpio_line_config(GPIO_HSS1_RTS_N, IXP4XX_GPIO_OUT);
421 gpio_line_config(GPIO_HSS0_DCD_N, IXP4XX_GPIO_IN);
422 gpio_line_config(GPIO_HSS1_DCD_N, IXP4XX_GPIO_IN);
423 irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_HSS0_DCD_N), IRQ_TYPE_EDGE_BOTH);
424 irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N), IRQ_TYPE_EDGE_BOTH);
425
426 set_control(CONTROL_HSS0_DTR_N, 1);
427 set_control(CONTROL_HSS1_DTR_N, 1);
428 set_control(CONTROL_EEPROM_WC_N, 1);
429 set_control(CONTROL_PCI_RESET_N, 1);
430 output_control();
431
432 msleep(1); /* Wait for PCI devices to initialize */
433
434 flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
435 flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
436
437 platform_add_devices(device_tab, devices);
438 }
439
440
441 #ifdef CONFIG_PCI
442 static void __init gmlr_pci_preinit(void)
443 {
444 irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHA), IRQ_TYPE_LEVEL_LOW);
445 irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHB), IRQ_TYPE_LEVEL_LOW);
446 irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_NEC), IRQ_TYPE_LEVEL_LOW);
447 irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_MPCI), IRQ_TYPE_LEVEL_LOW);
448 ixp4xx_pci_preinit();
449 }
450
451 static void __init gmlr_pci_postinit(void)
452 {
453 if ((hw_bits & CFG_HW_USB_PORTS) >= 2 &&
454 (hw_bits & CFG_HW_USB_PORTS) < 5) {
455 /* need to adjust number of USB ports on NEC chip */
456 u32 value, addr = BIT(32 - SLOT_NEC) | 0xE0;
457 if (!ixp4xx_pci_read(addr, NP_CMD_CONFIGREAD, &value)) {
458 value &= ~7;
459 value |= (hw_bits & CFG_HW_USB_PORTS);
460 ixp4xx_pci_write(addr, NP_CMD_CONFIGWRITE, value);
461 }
462 }
463 }
464
465 static int __init gmlr_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
466 {
467 switch(slot) {
468 case SLOT_ETHA: return IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHA);
469 case SLOT_ETHB: return IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHB);
470 case SLOT_NEC: return IXP4XX_GPIO_IRQ(GPIO_IRQ_NEC);
471 default: return IXP4XX_GPIO_IRQ(GPIO_IRQ_MPCI);
472 }
473 }
474
475 static struct hw_pci gmlr_hw_pci __initdata = {
476 .nr_controllers = 1,
477 .preinit = gmlr_pci_preinit,
478 .postinit = gmlr_pci_postinit,
479 .swizzle = pci_std_swizzle,
480 .setup = ixp4xx_setup,
481 .scan = ixp4xx_scan_bus,
482 .map_irq = gmlr_map_irq,
483 };
484
485 static int __init gmlr_pci_init(void)
486 {
487 if (machine_is_goramo_mlr() &&
488 (hw_bits & (CFG_HW_USB_PORTS | CFG_HW_HAS_PCI_SLOT)))
489 pci_common_init(&gmlr_hw_pci);
490 return 0;
491 }
492
493 subsys_initcall(gmlr_pci_init);
494 #endif /* CONFIG_PCI */
495
496
497 MACHINE_START(GORAMO_MLR, "MultiLink")
498 /* Maintainer: Krzysztof Halasa */
499 .map_io = ixp4xx_map_io,
500 .init_irq = ixp4xx_init_irq,
501 .timer = &ixp4xx_timer,
502 .boot_params = 0x0100,
503 .init_machine = gmlr_init,
504 #if defined(CONFIG_PCI)
505 .dma_zone_size = SZ_64M,
506 #endif
507 MACHINE_END
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